The study of 492 men from rural Brazil found that 35 percent of study participants, who ranged from 18 to 80 years old and included both penile cancer patients and healthy men, reported having sex with animals (SWA) in their lifetimes.

Of the 118 penile cancer patients, 45 percent reported having sex with animals, compared with 32 percent of healthy men, who visited the medical centers for benign conditions, check-ups or cancer prevention. Fifty-nine percent of men who had sex with animals did so for one to five years, while 21 percent continued the behavior, also known as zoophilia, for more than five years. The subjects reported a variety of frequencies for their sex acts, ranging from monthly to daily.